英语周报第四期2022-2022答案

6.B3【解析】本题考查静电场,目的是考查学生的分析综合能力。把圆环分为n等份(n足够大)每一份的电荷量为△小则有n=2,每小份可以看成点电衙,由点电荷的电场强度公式可知每小份产生的电场在P点的电场强度大小均为E≈k△,由几何关系sn37(AP)2A可得E=25,在点,E在垂直x轴方向的分量大小为E,根据对称性,n个E的矢量和为0,E在x轴方向的分量大小E,=Ecos37,n个E,的矢量36k和就是圆环产生的电场在P点的电场强度,即E=nE,解得E125产,选项B正确。

One possible versionSeveral minutes later, the ice broke suddenly and Harry's feet sank into the water. It was noep, but his legs got wet to the knees. Harry was so upset that the accident would delay hisschedule. He had to find some firewood to build a fire to dry his clothes. He pulled off his glovestook out his matches, and lighted the fire. Seeing the burning fire, he had thought he was safe. Butsuddenly, without warming, a heavy mass of snow dropped down. The flame of hope was put outUnluckily, his dog ran away and the fear of death came over Harry. He had no choice but torun to save himself. However, he did not feel his feet when they hit the ground. Having falleneveral times, he decided to rest a while. As he lay in the snow, he noticed he was not shaking. Hecould not feel his nose or fingers or feet. A feeling of horror came into his mind. It was when herealized he was going to die that he heard a bark and the noise his friends made

以上就是英语周报第四期2022-2022答案，更多英语周报答案请关注本网站。